[itex]\partial[/itex](adsbygoogle = window.adsbygoogle || []).push({}); _{μ}[itex]\phi[/itex][itex]\partial[/itex]^{μ}[itex]\phi[/itex]

and

[itex]\partial[/itex]_{μ}[itex]\partial[/itex]^{μ}[itex]\phi[/itex]

with [itex]\phi[/itex](x) a scalar field

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# Are the following 2 equations lorentz invariant?

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